What to Wear in San Diego
USA · 8 monthly packing guides
San Diego runs Pacific-coastal mild — May Gray (May marine-layer) and June Gloom keep mornings overcast through 10-11am; afternoons clear to 21-25°C / 70-77°F May-August. Coastal SD runs 4-8°C / 39-46°F cooler than inland LA in summer. The local register is Pacific-coastal surf-and-sailor: Hurley (Costa Mesa-founded 1979), RVCA (Costa Mesa 2001), Volcom (Newport Beach 1991), Roxy, Vans (Anaheim since 1966), James Perse, Vuori (Encinitas-founded 2015), Outerknown (Kelly Slater's Capistrano Beach brand). California enforces oxybenzone-restricted sunscreens at state beaches — reef-safe SPF 30+ mandatory. La Jolla, Coronado, Pacific Beach, Mission Beach hold the beach-cluster vocabulary; North Park, South Park, Hillcrest run urban-creative; Old Town for historic Mexican-California heritage. Comic-Con International runs late July at the convention center.
Choose your month below to match your layers and shoes to the weather. Across the months covered, average daily lows reach 10°C / 50°F in January; average highs reach 25°C / 77°F in August.
Compare San Diego by month
Monthly averages help compare packing needs; check the forecast before departure. Only months with published guides are listed. See the source notes below for station and measurement differences. Scroll across the table to see all weather details on a small screen.
| Month | Average low | Average high | Rain days | Daylight |
|---|---|---|---|---|
| January packing guide | 10°C / 50°F | 19°C / 66°F | 7 | 10h 15m |
| May packing guide | 14°C / 57°F | 21°C / 70°F | 2 | 13h 50m |
| June packing guide | 16°C / 61°F | 22°C / 72°F | 1 | 14h 25m |
| July packing guide | 18°C / 64°F | 24°C / 75°F | 0 | 14h 25m |
| August packing guide | 19°C / 66°F | 25°C / 77°F | 0 | 13h 35m |
| October packing guide | 16°C / 61°F | 24°C / 75°F | 2 | 11h 15m |
| November packing guide | 13°C / 55°F | 22°C / 72°F | 4 | 10h 30m |
| December packing guide | 10°C / 50°F | 19°C / 66°F | 6 | 10h 00m |
Choose your San Diego packing list
San Diego in January: 19°C / 66°F afternoons, 10°C / 50°F nights, about 7 rain days, more sun than June, and the peak of the gray whale migration.
In this capsule: Mid-blue oversized denim jacket; Oatmeal fisherman-rib crew; Pale blue oxford button-down.
San Diego in May is May Gray — 21°C / 70°F afternoons after the marine layer breaks, 14°C / 57°F mornings with overcast cloud cover that clears mid-morning.
In this capsule: Layered cotton/cashmere blend long-sleeve — neutral; Mid-weight cardigan or sweatshirt — Vuori, Outerknown, James Perse; Denim or chinos — Pacific coastal register.
San Diego in June is June Gloom — 22°C / 72°F afternoons after the marine layer breaks, 16°C / 61°F mornings, the same Pacific-coastal pattern as May Gray.
In this capsule: Layered cotton/cashmere blend long-sleeve — neutral; Mid-weight cardigan — Vuori, Outerknown, James Perse; Denim or chinos — Pacific coastal.
San Diego in July is summer peak — 24°C / 75°F afternoons, 18°C / 64°F mornings, 0 rain days. Comic-Con International runs late July, bringing 130k+ visitors.
In this capsule: Lightweight cotton tee + cotton dress; Denim shorts or chinos; Leather sneakers + Birkenstocks + Vans.
San Diego in August is the warmest month — 25°C / 77°F afternoons, 19°C / 66°F nights, 0 rain days, Pacific water at its warmest 21-22°C / 70-72°F.
In this capsule: Lightweight cotton tee + cotton dress; Denim shorts or chinos; Leather sneakers + Birkenstocks + Vans.
San Diego in October: 24°C / 75°F afternoons, 16°C / 61°F nights, 2 rain days — the mildest October evening on the California coast.
In this capsule: Ivory cotton cardigan with pearl buttons; Olive-khaki pleated short skirt; Plain one-piece swimsuit in black or deep olive.
San Diego in November: 22°C / 72°F afternoons, 13°C / 55°F nights, about 4 rain days, and a sunset near a quarter to five once the clocks go back.
In this capsule: Camel Harrington jacket, zip front, rib-trimmed collar and cuffs; Navy crew knit with wide ecru Breton stripes; Cognac linen midi dress, V-neck, puff sleeves, tie-waist cutout, side slit.
San Diego in December: 19°C / 66°F afternoons, 10°C / 50°F nights, about 6 rain days, and every plan worth dressing for starts after a sunset at about 4:45pm.
In this capsule: Olive-green cropped leather jacket, spread collar, zip front; Mid-grey crew-neck knit sweater, ribbed hem; Navy long-sleeve button-down, band collar.
Climate sources by month
These credits follow the source recorded on each monthly guide. Climate figures inform the packing advice; outfit combinations and illustrations are editorial suggestions.
- January: NOAA · San Diego International Airport (SAN) · 1991–2020 normals
- May: NOAA · San Diego International Airport (SAN) · 1991–2020 normals
- June: NOAA · San Diego International Airport (SAN) · 1991–2020 normals
- July: NOAA · San Diego International Airport (SAN) · 1991–2020 normals
- August: NOAA · San Diego International Airport (SAN) · 1991–2020 normals
- October: NOAA · San Diego International Airport (SAN) · 1991–2020 normals
- November: NOAA · San Diego International Airport (SAN) · 1991–2020 normals
- December: NOAA · San Diego International Airport (SAN) · 1991–2020 normals
Frequently asked questions
Start with your travel month. The 8 published guides cover January, May, June, July, August, October, November, December. Compare the average low as well as the high: among these months, January has the lowest average low at 10°C / 50°F, while August has the highest average high at 25°C / 77°F. For a trip spanning two months, read both lists before deciding which layers to bring.
No. They are monthly climate averages for planning, not temperatures promised for a particular day or hour. Check the local forecast close to departure and adjust your layers and rain protection. The source, station and averaging period are listed for each month where recorded; different stations or rain-day definitions can affect comparisons.
No. Treat the capsule as a set of clothing functions: walking shoes, a base outfit, weather protection and any change for dinner or a venue's dress code. Start with equivalents you own. Adjust quantities to your trip length and laundry access; the illustrations are outfit suggestions, not a shopping requirement.